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Download III - Renesas Electronics
Transcript
CHAPTER 9 APPLICATIONS OF A/D CONVERTER <RAM used> Name Usage Attribute Bytes SADDR 4 ADDAT Stores A/D conversion value DSPLEV Stores display level HLDLEV Stores hold level CT20MS Counter measuring 20 ms CT1S Counter measuring 1 s DIGCNT Display digit counter DSPDAT Stores display data 4 WORKCT Work counter for loop processing 1 1 <Flag used> Name Usage T20MSF Set every 20 ms T1SF Set every 1 s <Nesting> 2 levels 5 bytes <Hardware used> • A/D converter • 8-bit timer/event counter 1 • P6 <Initial setting> • OSMS = #00000001B ; Oscillation mode select register: does not use divider circuit • ADM = #1000×××1B ; Selects channel of A/D converter and starts operation • TCL1 = #10111011B ; Interval time of 2 ms of 8-bit timer/event counter 1 TMC1 = #00000001B CR10 = 130 • P6 output mode • Makes P6 output latch low • Enables INTTM1 interrupt 309
